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[PATCH] USB: One potential problem in gadget/serial.c 

It looks like that the gs_serial module maybe sleep with spinlock in gs_close.
Sometimes, system hang when I remove the gs_serial module.

From: Fengwei Yin <xaityyy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Fengwei Yin 2005-11-18 10:35:36 +08:00 committed by Greg Kroah-Hartman
parent 3d48586cfa
commit 949bf64311
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/gadget/serial.c
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@ -890,10 +890,12 @@ static void gs_close(struct tty_struct *tty, struct file *file)
/* wait for write buffer to drain, or */
/* at most GS_CLOSE_TIMEOUT seconds */
if (gs_buf_data_avail(port->port_write_buf) > 0) {
spin_unlock_irqrestore(&port->port_lock, flags);
wait_cond_interruptible_timeout(port->port_write_wait,
port->port_dev == NULL
|| gs_buf_data_avail(port->port_write_buf) == 0,
&port->port_lock, flags, GS_CLOSE_TIMEOUT * HZ);
spin_lock_irqsave(&port->port_lock, flags);
}
/* free disconnected port on final close */